I think I know the answer, but I can't find it clearly stated in a forum, and the diagnostic is, "S-Function ' mexw32_file_name' does not exist". The mex file was created with R2012a, and I am running 64-bit R2015a. The source model to rebuild the mex files is not readily available. Thanks.
MATLAB: Can older 32-bit mex files be run as S-functions in 64-bit Simulink
mexs-functionsimulink
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